After orchestrating an explosion in the Center, he escaped, along with Hanada, but at an unknown point, probably because of their sharply different objectives, they parted ways. After requesting a secret meeting with Aleph in the slums of Valhalla, he tells him that he must first rescue Hiroko (who was taken prisoner by the Center) before telling him exactly who he is and why his memory was erased. When the time for the answers came, however, Aleph and Hiroko discovered that he, along with all of Valhalla, was swallowed up by a gargantuan demon named Abaddon, sent by the Center to erase him along with the people of Valhalla.

It is revealed later in Abaddon's innards by Mekata himself that after having his daughter, Hiroko, chosen as the surrogacy for the Messiah Project, his guilt led him to flee the Center with Hiroko and the baby Aleph to the slums of Valhalla. As Aleph grew rapidly in just one day (at a rate of 10 years every 24 hours so he would be an adult in a very short amount of time), Mekata entrusted him to Okamoto.